已知x+y=17,xy=60,则x2+y2=_.
问题描述:
已知x+y=17,xy=60,则x2+y2=______.
答
∵x+y=17,xy=60,
∴x2+y2=(x+y)2-2xy=172-2×60=169.
故本题答案为:169.